The answer is: Sacrificed them

Numbers 22:40

In Numbers 22, the narrative surrounding Balaam and his talking donkey unfolds in an intriguing way that blends divine intervention with themes of obedience and folly. When Balak, the king of Moab, reaches out to Balaam, he hopes to curse Israel because he saw them as a threat. Balak arrives at Kiriath-Huzoth with a whole herd of cattle and sheep, which he sacrifices in a bid to invoke the favor of the gods and secure Balaam's assistance.

Sacrificing animals was a common practice in ancient religious rituals. In many cultures, sacrifices were a way to honor deities and seek blessings or guidance. Interestingly, animals represented not just offerings to the gods but also the very essence of sustenance for communities—a ritualistic intertwining of faith and practicality. The fact that Balak brought cattle and sheep illustrating an abundance signifies his seriousness in seeking Balaam's powerful blessing.

As this story further illustrates, Balaam, the infamous prophet who's more connected to his own self-interest than divine wisdom, strikes a playful contrast with his stubborn donkey. That humble donkey comes to symbolize understanding and wisdom in the face of human folly. This narrative resonates beyond just this story, reminding us that there’s often more than meets the eye in matters of faith, decisions, and even the wisdom of unlikely sources.